I. Computer security basics -- 1. Introduction -- 2. Policies and guidelines -- II. User responsibilities -- 3. Users and passwords -- 4. Users, groups, and the superuser -- 5. The UNIX filesystem -- 6. Cryptography -- III. System security -- 7. Backups -- 8. Defending your accounts -- 9. Integrity management -- 10. Auditing and logging -- 11. Protecting against programmed threats -- 12. Physical security -- 13. Personnel security -- IV. Network and Internet security -- 14. Telephone security -- 15. UUCP -- 16. TCP/IP networks -- 17. TCP/IP services -- 18. WWW security -- 19. RPC, NIS, NIS+, and Kerberos -- 20. NFS -- V. Advanced topics -- 21. Firewalls -- 22. Wrappers and proxies -- 23. Writing secure SUID and network programs -- VI. Handling security incidents -- 24. Discovering a break-in -- 25. Denial of service attacks and solutions -- 26. Computer security and U.S. law -- 27. Who do you trust? -- VII. Appendixes -- A. UNIX security checklist -- B. Important files -- C. UNIX processes -- D. Paper sources -- E. Electronic resources -- F. Organizations -- G. Table of IP services.